This property is
an array containing references to all the named child frames in the
current window. These references are stored in the array in the order
in which they are defined in the source code. The "frameID"
argument is used to access items in the array and this can either be
a string containing the child frame name as defined with the <FRAME>
tag in the HTML source, or an integer (with '0' being the first item
in the array).
The first two examples below return the same results; the first uses
the defined names of the frames and the second uses their reference
number within the array.
The frames array also has a length property
which determines how many child frames are contained within a window.
This is identical to using the length property of the window object.
The third example shows the syntax for this.